fix(esp_https_server): restore use_secure_element initializer in HTTPD_SSL_CONFIG_DEFAULT()

36090b7161 removed use_secure_element from httpd_ssl_config and from
HTTPD_SSL_CONFIG_DEFAULT(). 8fe74703bc then restored the member to the
struct to keep source compatibility, but did not restore it to the macro,
so HTTPD_SSL_CONFIG_DEFAULT() no longer initializes every member of the
struct it is documented to initialize.

C tolerates the gap in designated initializers, but C++ diagnoses it as
-Wmissing-field-initializers, which is fatal for applications built with
-Werror.

components/esp_https_server/include/esp_https_server.h

@@ -233,6 +233,7 @@ typedef struct httpd_ssl_config httpd_ssl_config_t;
     .port_secure = 443,                           \
     .port_insecure = 80,                          \
     .session_tickets = false,                     \
+    .use_secure_element = false,                  \
     .user_cb = NULL,                              \
     .ssl_userdata = NULL,                         \
     .cert_select_cb = NULL,                       \